/* ============================================================
   AI STANDARD — media design system
   brand: TrysLinx (navy #050D17 / cyan #45C8DB) × readable light
   ============================================================ */
:root{
  --ink:#0B1320;          /* 本文の濃紺ブラック */
  --ink-soft:#3D4657;
  --paper:#FAF8F4;        /* 背景 */
  --paper-2:#F1EEE7;
  --navy:#050D17;         /* ヘッダー/フッター */
  --cyan:#45C8DB;         /* ブランドシアン(暗背景用) */
  --cyan-deep:#0E7E96;    /* 明背景用シアン(コントラスト確保) */
  --line:rgba(11,19,32,.12);
  --f-display:'Shippori Mincho B1', serif;
  --f-body:'Noto Sans JP', sans-serif;
  --f-mono:'IBM Plex Mono', monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--f-body);background:var(--paper);color:var(--ink);line-height:2;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto}
a{color:var(--cyan-deep)}

/* ---------- header ---------- */
.mh{position:sticky;top:0;z-index:50;background:var(--navy);color:#EDEBE4;border-bottom:1px solid rgba(69,200,219,.25)}
.mh-in{max-width:1080px;margin:0 auto;display:flex;align-items:center;gap:18px;padding:14px clamp(16px,4vw,28px)}
.mh-brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:#fff}
.mh-brand img{width:24px;height:24px;object-fit:contain}
.mh-brand b{font-family:var(--f-mono);font-weight:600;font-size:15px;letter-spacing:.14em}
.mh-brand small{font-family:var(--f-mono);font-size:9px;letter-spacing:.18em;color:var(--cyan);border:1px solid rgba(69,200,219,.4);border-radius:99px;padding:2px 8px}
.mh-nav{margin-left:auto;display:flex;gap:clamp(10px,2.4vw,26px);align-items:center}
.mh-nav a{font-family:var(--f-mono);font-size:11px;letter-spacing:.12em;color:rgba(237,235,228,.75);text-decoration:none}
.mh-nav a:hover{color:var(--cyan)}
.mh-cta{background:var(--cyan);color:#04222B !important;border-radius:99px;padding:8px 16px;font-weight:600}
@media(max-width:680px){.mh-nav a:not(.mh-cta){display:none}}

/* ---------- breadcrumb ---------- */
.bc{max-width:1080px;margin:0 auto;padding:14px clamp(16px,4vw,28px) 0;font-size:11.5px;color:var(--ink-soft)}
.bc a{color:var(--ink-soft);text-decoration:none}
.bc a:hover{color:var(--cyan-deep)}
.bc span{margin:0 6px;opacity:.5}

/* ---------- media top hero ---------- */
.mhero{background:linear-gradient(170deg,var(--navy) 0%,#0A2233 100%);color:#EDEBE4;padding:clamp(54px,9vh,100px) clamp(16px,4vw,28px) clamp(60px,10vh,110px);position:relative;overflow:hidden}
.mhero::after{content:"STANDARD";position:absolute;right:-20px;bottom:-30px;font-family:var(--f-mono);font-weight:600;font-size:clamp(80px,14vw,180px);letter-spacing:.02em;color:transparent;-webkit-text-stroke:1px rgba(69,200,219,.14);pointer-events:none}
.mhero-in{max-width:1080px;margin:0 auto;position:relative;z-index:2}
.mhero-tag{font-family:var(--f-mono);font-size:11px;letter-spacing:.3em;color:var(--cyan)}
.mhero h1{font-family:var(--f-display);font-weight:800;font-size:clamp(30px,5.4vw,58px);letter-spacing:.04em;line-height:1.5;margin-top:16px}
.mhero h1 em{font-style:normal;color:var(--cyan)}
.mhero p{margin-top:18px;max-width:38em;color:rgba(237,235,228,.78);font-size:clamp(13px,1.5vw,15px)}
.mhero-by{margin-top:26px;font-family:var(--f-mono);font-size:10.5px;letter-spacing:.16em;color:rgba(237,235,228,.55)}
.mhero-by b{color:var(--cyan);font-weight:500}

/* ---------- section ---------- */
.msec{max-width:1080px;margin:0 auto;padding:clamp(44px,7vh,80px) clamp(16px,4vw,28px)}
.msec-en{font-family:var(--f-mono);font-size:11px;letter-spacing:.28em;color:var(--cyan-deep)}
.msec h2{font-family:var(--f-display);font-weight:700;font-size:clamp(22px,3.2vw,34px);letter-spacing:.05em;margin-top:10px}
.msec-lead{margin-top:12px;color:var(--ink-soft);font-size:14px;max-width:44em}

/* ---------- category chips ---------- */
.cats{display:flex;gap:10px;flex-wrap:wrap;margin-top:26px}
.cat{display:inline-flex;flex-direction:column;gap:2px;border:1px solid var(--line);border-radius:14px;padding:14px 20px;text-decoration:none;color:var(--ink);background:#fff;transition:border-color .25s,transform .25s}
.cat:hover{border-color:var(--cyan-deep);transform:translateY(-2px)}
.cat b{font-family:var(--f-mono);font-size:10px;letter-spacing:.2em;color:var(--cyan-deep);font-weight:600}
.cat span{font-weight:700;font-size:14.5px}

/* ---------- article cards ---------- */
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(290px,1fr));gap:22px;margin-top:30px}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;overflow:hidden;text-decoration:none;color:var(--ink);display:flex;flex-direction:column;transition:transform .3s,box-shadow .3s,border-color .3s}
.card:hover{transform:translateY(-4px);box-shadow:0 14px 34px rgba(11,19,32,.10);border-color:rgba(14,126,150,.45)}
.card-eye{height:128px;display:flex;align-items:center;justify-content:center;background:linear-gradient(150deg,#0A2233,#0E3A4D);position:relative;overflow:hidden}
.card-eye span{font-family:var(--f-display);font-weight:800;font-size:54px;color:transparent;-webkit-text-stroke:1.2px rgba(69,200,219,.5)}
.card-eye i{position:absolute;left:14px;top:12px;font-style:normal;font-family:var(--f-mono);font-size:9px;letter-spacing:.18em;color:var(--cyan);border:1px solid rgba(69,200,219,.4);border-radius:99px;padding:2px 9px}
.card-bd{padding:18px 20px 20px;display:flex;flex-direction:column;gap:8px;flex:1}
.card-bd h3{font-size:15.5px;font-weight:700;line-height:1.7}
.card-bd p{font-size:12.5px;color:var(--ink-soft);line-height:1.8}
.card-ft{margin-top:auto;padding-top:10px;font-family:var(--f-mono);font-size:10px;letter-spacing:.1em;color:var(--ink-soft);display:flex;justify-content:space-between}
.card.soon{opacity:.55;pointer-events:none}
.card.soon .card-ft::after{content:"COMING SOON";color:var(--cyan-deep)}

/* ---------- curriculum levels ---------- */
.lv{display:flex;flex-direction:column;gap:14px;margin-top:30px}
.lv-item{background:#fff;border:1px solid var(--line);border-left:4px solid var(--cyan-deep);border-radius:14px;padding:22px clamp(18px,3vw,30px)}
.lv-item h3{font-family:var(--f-display);font-size:clamp(17px,2vw,21px);font-weight:700;display:flex;align-items:baseline;gap:14px;flex-wrap:wrap}
.lv-item h3 b{font-family:var(--f-mono);font-weight:600;font-size:11px;letter-spacing:.2em;color:var(--cyan-deep)}
.lv-item p{font-size:13px;color:var(--ink-soft);margin-top:8px}
.lv-lessons{margin-top:14px;display:flex;flex-direction:column;gap:6px}
.lv-lessons a,.lv-lessons span{font-size:13.5px;padding:9px 14px;border-radius:9px;background:var(--paper-2);text-decoration:none;color:var(--ink);display:flex;justify-content:space-between;gap:10px}
.lv-lessons a:hover{background:#E6F4F7}
.lv-lessons em{font-style:normal;font-family:var(--f-mono);font-size:9.5px;letter-spacing:.12em;color:var(--cyan-deep);white-space:nowrap}
.lv-lessons span{opacity:.55}
.lv-lessons span em{color:var(--ink-soft)}

/* ---------- article page ---------- */
.art{max-width:760px;margin:0 auto;padding:clamp(30px,5vh,54px) clamp(16px,4vw,28px) clamp(60px,9vh,100px)}
.art-cat{font-family:var(--f-mono);font-size:10.5px;letter-spacing:.22em;color:var(--cyan-deep)}
.art h1{font-family:var(--f-display);font-weight:800;font-size:clamp(24px,4vw,36px);line-height:1.6;letter-spacing:.03em;margin-top:12px}
.art-meta{display:flex;gap:18px;flex-wrap:wrap;margin-top:16px;padding-bottom:22px;border-bottom:1px solid var(--line);font-size:12px;color:var(--ink-soft)}
.art-meta b{font-weight:600;color:var(--ink)}
.tldr{margin-top:26px;background:#fff;border:1px solid rgba(14,126,150,.35);border-radius:14px;padding:20px 24px}
.tldr h2{font-family:var(--f-mono);font-size:11px;letter-spacing:.24em;color:var(--cyan-deep);margin:0 0 10px;border:none;padding:0}
.tldr ul{margin:0;padding-left:1.3em}
.tldr li{font-size:14px;font-weight:600;margin:6px 0;line-height:1.9}
.toc{margin-top:26px;background:var(--paper-2);border-radius:14px;padding:18px 24px}
.toc b{font-family:var(--f-mono);font-size:10.5px;letter-spacing:.22em;color:var(--ink-soft)}
.toc ol{margin:10px 0 0;padding-left:1.4em}
.toc li{font-size:13.5px;margin:5px 0}
.toc a{text-decoration:none;color:var(--ink)}
.toc a:hover{color:var(--cyan-deep)}
.art h2{font-family:var(--f-display);font-weight:700;font-size:clamp(19px,2.6vw,25px);letter-spacing:.04em;line-height:1.7;margin-top:54px;padding-top:10px;border-top:2px solid var(--ink)}
.art .tldr h2{font-family:var(--f-mono);font-size:11px;letter-spacing:.24em;color:var(--cyan-deep);margin:0 0 10px;padding:0;border:none}
.art h3{font-size:16.5px;font-weight:700;margin-top:34px}
.art p{margin-top:16px;font-size:15px}
.art ul,.art ol{margin:16px 0 0 1.4em;font-size:15px}
.art li{margin:7px 0}
.art table{width:100%;border-collapse:collapse;margin-top:18px;font-size:13.5px;background:#fff}
.art th,.art td{border:1px solid var(--line);padding:10px 13px;text-align:left;vertical-align:top}
.art th{background:var(--paper-2);font-weight:700;white-space:nowrap}
.art .pt{background:#fff;border-left:4px solid var(--cyan-deep);border-radius:0 12px 12px 0;padding:16px 20px;margin-top:18px;font-size:14px}
.art .pt b{color:var(--cyan-deep)}
.faq{margin-top:18px;display:flex;flex-direction:column;gap:12px}
.faq details{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 20px}
.faq summary{font-weight:700;font-size:14.5px;cursor:pointer}
.faq details p{font-size:13.5px;margin-top:10px;color:var(--ink-soft)}
.src{margin-top:18px;font-size:12px;color:var(--ink-soft)}
.src ul{margin:8px 0 0 1.3em}
.src a{word-break:break-all}

/* ---------- curriculum lesson nav ---------- */
.lnav{display:grid;grid-template-columns:1fr auto 1fr;gap:12px;align-items:stretch;margin-top:46px}
.lnav-a{display:flex;flex-direction:column;gap:5px;justify-content:center;text-decoration:none;
  background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px 18px;color:var(--ink);transition:border-color .25s,transform .25s}
.lnav-a:hover{border-color:var(--cyan-deep);transform:translateY(-2px)}
.lnav-a small{font-family:var(--f-mono);font-size:9.5px;letter-spacing:.12em;color:var(--cyan-deep)}
.lnav-a b{font-size:12.5px;font-weight:700;line-height:1.5}
.lnav-a.next{text-align:right;align-items:flex-end}
.lnav-a.empty{visibility:hidden}
.lnav-pos{align-self:center;font-family:var(--f-mono);font-size:10px;letter-spacing:.16em;color:var(--ink-soft);white-space:nowrap}
@media(max-width:640px){.lnav{grid-template-columns:1fr}.lnav-pos{order:-1;text-align:center}.lnav-a.next{align-items:flex-start;text-align:left}}

/* ---------- CTA band ---------- */
.cta-band{margin-top:54px;background:linear-gradient(150deg,var(--navy),#0A2A3D);border-radius:18px;padding:clamp(26px,4vw,40px);color:#EDEBE4;text-align:center}
.cta-band h2{font-family:var(--f-display);font-size:clamp(18px,2.6vw,24px);font-weight:700;border:none;margin:0;padding:0}
.cta-band h2 em{font-style:normal;color:var(--cyan)}
.cta-band p{font-size:13px;color:rgba(237,235,228,.75);margin-top:10px}
.cta-band .btns{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin-top:20px}
.cta-band a{display:inline-block;border-radius:99px;padding:12px 26px;font-size:13.5px;font-weight:700;text-decoration:none}
.cta-band a.p{background:var(--cyan);color:#04222B}
.cta-band a.s{border:1px solid rgba(237,235,228,.4);color:#EDEBE4}

/* ---------- related ---------- */
.rel{margin-top:46px}
.rel h2{border:none;font-size:clamp(17px,2.2vw,21px);margin-top:0}

/* ---------- footer ---------- */
.mf{background:var(--navy);color:rgba(237,235,228,.7);margin-top:clamp(50px,8vh,90px)}
.mf-in{max-width:1080px;margin:0 auto;padding:clamp(36px,6vh,60px) clamp(16px,4vw,28px);display:flex;flex-wrap:wrap;gap:30px;justify-content:space-between;align-items:flex-start}
.mf-brand{display:flex;align-items:center;gap:10px;color:#fff;text-decoration:none}
.mf-brand img{width:22px;height:22px}
.mf-brand b{font-family:var(--f-mono);letter-spacing:.14em;font-size:14px}
.mf-note{font-size:11.5px;max-width:34em;line-height:1.9;margin-top:12px}
.mf-nav{display:flex;gap:22px;flex-wrap:wrap}
.mf-nav a{color:rgba(237,235,228,.7);text-decoration:none;font-size:12px;font-family:var(--f-mono);letter-spacing:.1em}
.mf-nav a:hover{color:var(--cyan)}
.mf-copy{border-top:1px solid rgba(237,235,228,.12);text-align:center;font-family:var(--f-mono);font-size:10px;letter-spacing:.18em;padding:18px;color:rgba(237,235,228,.45)}